I'm sorry if this is a dumb question, however I am a newbie and I need to ask. I just bought a P4C800 and a 3.00 800 FSB CPU and I am wondering what to run for ram with this motherboard. I am looking at the Corsair XMS as well as the Kingston Hyper X in the pc3500 series. Am I better off to run 2 512 MB sticks or 4 256 MB sticks? I don't really understand how the "dual channel" thing works. Do I need to run "matched" sticks or is it just better? Also I am going to move my GeForce 4 4600 TI over from my old system until the Radion 9800 Pro comes out, but I should upgrade my Hard drive. Does anyone make a TRUE serial ATA interface or are they just 133 adapted to serial?